31415921421 has 16 divisors (see below), whose sum is σ = 43726811136. Its totient is φ = 20025227376.

The previous prime is 31415921419. The next prime is 31415921437. The reversal of 31415921421 is 12412951413.

It is not a de Polignac number, because 31415921421 - 2¹ = 31415921419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31415911421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81756 + ... + 263658.

It is an arithmetic number, because the mean of its divisors is an integer number (2732925696).

Almost surely, 2^31415921421 is an apocalyptic number.

It is an amenable number.

31415921421 is a deficient number, since it is larger than the sum of its proper divisors (12310889715).

31415921421 is a wasteful number, since it uses less digits than its factorization.

31415921421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184432.

The product of its digits is 8640, while the sum is 33.

The spelling of 31415921421 in words is "thirty-one billion, four hundred fifteen million, nine hundred twenty-one thousand, four hundred twenty-one".